Female, M. enceliae vs M. mentzeliae | Male, M. enceliae vs M. mentzeliae | Sex, number of antennal segments | State or province where bee was collected

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1. State or province where bee was collected

4AZ    2CA    4NV   

2. Sex, number of antennal segments

2Female, 12    2Male, 13   

3. Female, M. enceliae vs M. mentzeliae

1M. enceliae - The mandible is relatively normal, with at least a slight hint of a subapical tooth near its tip, be careful as this may be hard to see if the mandibles are worn - T1 is weakly patterned by microscopic markings medially, if at all, such that the surface often seems somewhat shiny - The basal hair band of T2 is USUALLY well-developed and without a gap in the center such that it forms a continuous band across the segment, often becoming thicker and extending toward the posterior rim of T2 medially - The integument of the abdomen is equally dark, blackish, throughout - In direct comparison, much larger than M. mentzeliae, usually about 15mm    1M. mentzeliae - The mandible is very slender, uninterrupted in its upper length, without a subapical tooth - T1 is strongly patterned by microscopic markings medially, the area between pits usually appearing heavily dulled - The basal hair band of T2 is considerably weakened normally, such that it is usually incomplete medially - The integument of the abdomen is ALMOST ALWAYS reddened basally and darkened near the tip - In direct comparison, much smaller than M. enceliae, usually close to 10mm   

4. Male, M. enceliae vs M. mentzeliae

1M. enceliae - The mandibles are all dark, blackish - There is a greater amount of hair present basally on T2, the longitudinal width of the hair patch usually equal to or greater than that of the apical hair band, and in direct comparison, the hairs here appear generally longer than those of M. mentzeliae - The integument of the abdomen is equally dark, blackish, throughout - In direct comparison, much larger than M. mentzeliae, usually approaching 15mm in total length although some specimens may be closer to 12-13mm    1M. mentzeliae - The mandibles are primarily a light yellowish color, although the tips are often a darker blackish color - The basal area of T2 has less hair present, the longitudinal thickness of the hair patch here usually being less than that of the apical hair band, and, in direct comparison, the hairs here appear generally shorter than those of M. enceliae - The integument of the abdomen is ALMOST ALWAYS primarily or almost entirely red, although sometimes, uncommonly, there will be a specimen with some darker blackish areas - In direct comparison, much smaller than M. enceliae, usually closer to 10-11mm in length although some specimens may approach 13mm